Camelbak Hydrobak is the little brother to the Classic 2.5. It carries 1.5L of water , your phone and an energy bar, and nothing else. No excess weight, no excess straps; just what you need for short fast trips on foot or on the mountain bike.
Trimmed down desigh; no excess baggage
Secure pocket for essentials
External Fill; no need to remove reservoir to refill
Waist Belt: No
Hydration Volume (L): 1.5
Cargo Capacity (L): small pocket
Total Weight, pack only (g): 150